Matthews repeated the goal celebration with Jack Eichel at the NHL All-Star Game, and now I’m happy to report you can do the celly now as Matthews on NHL18 too. During the most recent NHL18 roster update, video game developers assigned a previously created custom celebration to Digi Auston and it’s great.

To get Digi Auston to start pointing, just press Y/Triangle after scoring.

I think others in the EA NHL community have said that the celebration was already in the game as a custom celly, but EA's recent update just mapped it to Auston's character so it's the default when he presses Y/Triangle.